Thread retarder for shuttles



Aug. 15, 1961 J. F. scHRODER THREAD RETARDER FOR SHUTTLES 3 Sheets-Sheet 1 Filed Dec. 8, 1959 [75.1

INVENTOR.

ATTdRA/EYS Aug. 15, 1961 J. F. SCHRODER THREAD RETARDER FOR SHUTTLES :s Sheets-Sheet 2 Filed Dec. 8, 1959 INVENTOR. JOHANN FRIEDRICH sclmoflz 1 ATTORNEYS Aug. 15, 1961 J. F. SCHRGDER 2,996,034

THREAD RETARDER FOR SHUTTLES Filed Dec. 8; 1959 3 Sheets-Sheet 3 H INVENTOR.

IN 11i .lamm/mlioncusumbam 1 I BY 80 W ATTORNEYS United States Patent 2,996,084 THREAD RETARDER FOR SHUTTLES Johann Friedrich Schriider, Reutlingen-Betzingen, Germany, assignor to C. C. Egelhaaf, Kommanditgesellschaft, Reutlingen, Germany Filed Dec. 8, 1959, Ser. No. 858,142 7 Claims. (Cl. 139-213) The present invention relates to shuttles and particularly to a retarder mechanism for such shuttles whereby the running weft thread is automatically guided between pads of the retarder. This application is a continuationin-part of applicants co-pending application, Ser. No. 746,027, filed on July 1, 1958, now abandoned.

Looms with automatic changing of shuttle cops are known wherein the cop is monitored by a gauging means, and the remnant of an exhausted copy is automatically removed from the shuttle by an ejecting means before insertion of the fresh cop. The feeler of the gauging means is released when the cop has unwound down to a small remnant. This actuates the ejecting means, usually comprising a hook entering the shuttle at one end and ejecting the cop remnant at the other end. After insertion of a fresh cop, the shuttle is threaded automatically by means of special thread guides.

This arrangement is not adequate under all circumstances to ensure proper guidance and sufiicient tension of the weft thread as it passes out of the shuttle. Means are required for additionally retarding the thread.

The retarder according to the invention will be more fully described with reference to the accompanying drawings, but it should be understood that this is given by way of illustration and not of limitation and that many changes in the details may be made without departing from the spirit of the invention.

In the drawings,

FIG. 1 is a top elevation of a shuttle with retarder according to the invention, showing the cop remnant;

FIG. 2 is a side elevation view of the shuttle;

FIG. 3 is a partial bottom elevation of the shuttle;

FIG. 4 is a section along line 44 in FIG. 2;

FIG. 5 is a section taken along line 55 of FIG. 4;

FIG. 6 is an end elevation taken along line 66 of FIG. 4 showing the structural details of the working mechanism;

FIG. 7 shows the retarder pad mechanism with the ejector hook in operation;

FIG. 8 is a section 'view taken along line 8-8 of FIG. 5, and

FIG. 9 is a section view taken along line 99 of FIG. 5.

The shuttle 10 is loaded in known manner with a hollow cop, the remnant 16 of which is automatically removed by the ejector after unwinding of the thread. The ejecting mechanism may for example comprise an ejector 18 actuated in known manner not illustrated in the drawing, which ejector enters the slot 20 past the spring thread guide 22, which is mounted on pin 24 secured to plate 26, in which process it must pass between the two retarder pads 28 and 28'. A second pair of retarder pads 30 and 30' are provided. The weft thread 32 is retarded by the two pairs of retarders 28, 28' and 30, 30'. The entire mechanism 34 is inserted into shuttle 10 through cutout opening 36 in bottom 38 of the shuttle and secured to the shuttle by means of Allen screws 40. Opening 36 is closed by plate 42, which itself is secured to the retarder mechanism U-shaped member 44, attached to base plate 48 by Allen screws 50. Retarder pads 28, 28 and 30, 30' are pivotable on levers 52, 52' and 54, 54, which in turn are pivotable on pins 56, 56' and 58, 58' extending into the ends of base plate 48. Both pairs of retarder pads 28, 28' and 30 Patented Aug. 15, 1961 and 30 as Well as levers 52, 52' and 54, 54' are identical in construction and operation. To permit the pivotable movement of the lever pairs and pads, base plate 48 is formed with grooves 60, 62 the bottom portions 63, 63 of which are provided with rectangular openings such as shown at 64, 66, 68, for the passage of the levers and extended pad ends 29, 29' which serve as guides for the movement of the pads, as best seen in FIG. 8. V

The bottom ends 53, 53' and 55, 55' of the levers are connected to slide bars 70, 72 by pins 74, 76 and 78 and 80. Levers 52, 54 at opposite ends of base plate 48 are pivotally secured to their respective slide bars. The lever ends of levers 52 and 54", on the other hand, are slidably secured in slots 82 and 84 of the respective slide bars. Compression springs 86, 88 and washers 90, 90' and 92, 92' are provided on the respective slide bars to maintain the pairs of pads in closed position by exerting tension on the lever ends 53, 53 and 55, 55'. Washers 90, 90 and 92, 92' are provided with slots so that they are slidable on the bars to permit the movement of the levers upon compression of the springs 86 and 88, to allow the diverging movement of the pads when thread 32 is inserted, or when ejector 18 passes between pads 28, 28'.

A guide plate 108 for the thread 32, integral with a block 110 is secured longitudinally by means of said block to base plate 48. The guide plate 108 is formed with an arcuate recess 112 into which is received a laterally pivotable thread guide dog 114.

The thread guide dog is provided on its lower surface with a thread guide channel 116 for thread 32, as shown in FIG. 9. The dog is pivotally mounted in a recessed block 118, which is secured to base plate 48, by means of pin 120 over which is fitted a spiral spring 122. Spring .122 tensions the dog 114 into closed position in recess 112. In this position the dog 114 prevents thread 32 from moving upwardly and out of the retarding clamps. To permit the threading of the device dog 114 is moved against the tension of spring 122 in the direction indicated by arrow 128 in FIG. 4.

What I claim is:

1. Thread retarder mechanism for shuttles comprising, a mounting plate, a U-shaped member secured to said mounting plate, a base plate mounted on said U-shaped members, a first pair and a second pair of retarder pads pivotably secured to adjacent respective opposed ends of said base plate and in longitudinal alignment with one another, said pads extending perpendicularly of said base plate, spring means normally urging the pads of each of said pairs into contact with one another, a guide plate extending vertically of said base plate and longitudinally between said retarder pads for guiding a thread between said retarder pads and a spring guide for a thread secured to one end of said base plate.

2. Thread retarder mechanism according to claim 1, further provided with a guide dog for a thread, having one end pivoted laterally on said base plate, said guide plate having a recess receiving the other end of said dog, and a spiral spring secured to said base plate, normally maintaining said other end of the dog in said recess.

3. Thread retarder mechanism according to claim 2, further provided with first and second pairs of levers pivoted at their central portions to said opposed ends of the base plate, each of said first and second retarder pad pairs being secured to one end of each said lever.

4. Thread retarder mechanism according to claim 3,

.further provided with a pair of slide bars, each of said slide bars having its ends pivotably connected to the other ends of said pair of levers, a pair of compression springs, each displaceable on each of said levers and washers interspaced between said lever ends and said springs.

3 4 5. Thread retarder mechanism according to claim 4, 7. Thread retarder mechanism according to claim 6, wherein said retarder pads are formed with rounded top wherein the other end of said guide dog is rounded. g i ijgf fi to facmtate the entry of a Weft thread, References Cited in the file of this patent 6. Thread retarder mechanism according to claim 5, 5 UNITED STATES PATENTS wherein said rounded tops normally converge into con- 2,107,917 Tebo Feb. 8, 1938 tact relationship under the action of said compression 2,403,724 Kaufmann July 9, 1946 springs. 2,859,779 Parks Nov. 11, 1958 

